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United States Patent |
5,556,046
|
Irmen
,   et al.
|
September 17, 1996
|
Apparatus for prepositioning a yarn end on spinning cops for subsequent
unwinding in a bobbin winding machine
Abstract
An apparatus for prepositioning a yarn end on a spinning cop for subsequent
unwinding in a bobbin winding machine accomplishes improved functional
capabilities by providing a positionally changeable yarn guiding device as
well as a yarn retaining device. A part of the yarn guiding device which
comes into contact with the yarn can be moved from an active position
below the upper edge of the cop into an inactive position above the cop
nose. The yarn retaining device has an opening for yarn entry. By way of a
control device, the yarn guiding device is controlled to take up the
inactive position following the placement of nose windings about the cop
nose, and a device for inserting the remaining yarn end portion into the
tubular interior of the cop is then activated and the yarn retaining
device is taken out of contact with the upper edge of the cop. Preferably,
the yarn inserting device comprises a tubular arbor which can be
positioned centrally above the cop to function as a yarn end blower
nozzle.
Inventors:
|
Irmen; Wolfgang (Monchengladbach, DE);
Kohlen; Helmut (Erkelenz, DE)
|
Assignee:
|
W. Schlafhorst AG & Co. (Moenchengladbach, DE)
|
Appl. No.:
|
498998 |
Filed:
|
July 6, 1995 |
Foreign Application Priority Data
| Jul 12, 1994[DE] | 44 24 462.2 |
Current U.S. Class: |
242/475.9 |
Intern'l Class: |
B65H 054/00; B65H 069/04 |
Field of Search: |
242/35.6 E,18 R,18 EW,35.5 A,35.5 R,35.6 R
|
References Cited
U.S. Patent Documents
4901931 | Feb., 1990 | Mista | 242/18.
|
4909451 | Mar., 1990 | Kuepper et al. | 242/35.
|
4928903 | May., 1990 | Wirtz et al. | 242/35.
|
5050811 | Sep., 1991 | Nishimura et al. | 242/18.
|
5106027 | Apr., 1992 | Wirtz et al. | 242/35.
|
5232171 | Aug., 1993 | Hensen | 242/35.
|
Foreign Patent Documents |
7531710.1 | Mar., 1977 | DE.
| |
3608862A1 | Sep., 1987 | DE.
| |
3726338A1 | Feb., 1989 | DE.
| |
3924000A1 | Jan., 1990 | DE.
| |
3-120174 | May., 1991 | JP.
| |
Primary Examiner: Mansen; Michael R.
Attorney, Agent or Firm: Shefte, Pinckney & Sawyer
Claims
We claim:
1. An apparatus for prepositioning a yarn end on a tubular spinning cop in
preparation for subsequent unwinding in a bobbin winding machine,
comprising a drive for rotating the cop about its longitudinal axis at a
cop preparation station, a suction nozzle stationarily disposed at the cop
preparation station for aspirating and holding the yarn end, the nozzle
having a yarn receiving slit extending lengthwise of the cop to a terminal
end of the slit axially beyond a nose portion of the cop, a cutting device
for cutting the yarn end to length, a yarn guide means for delivering a
first portion of the yarn end to the nose portion of the cop for placing
nose windings of the yarn thereabout, the yarn guide means being movable
relative to the cop at the cop preparation station between an inactive
position spaced axially from the nose portion of the cop and an active
position generally alongside the nose portion of the cop, means for
inserting a remaining portion of the yarn end into a tubular interior of
the spinning cop, yarn retaining means selectively movable into and out of
contact with the nose portion of the cop and having an opening for
delivery of the yarn end therethrough to the nose portion of the cop, and
means for controlling movement of the yarn guide means into the active
position during placement of nose windings about the nose portion of the
cop and the inactive position after placement of the nose windings and for
controlling activation of the yarn inserting means and movement of the
yarn retaining means out of contact with the nose portion of the cop after
movement of the yarn guide means into the inactive position.
2. An apparatus for prepositioning a yarn end on a tubular spinning cop in
accordance with claim 1 wherein the yarn inserting means comprises a
nozzle for blowing air into the tubular interior of the spinning cop.
3. An apparatus for prepositioning a yarn end on a tubular spinning cop
according to claim 2 wherein the blower nozzle is oriented to direct blown
air along an oblique axis inclined to the opening of the yarn retaining
means.
4. An apparatus for prepositioning a yarn end on a tubular spinning cop
according to claim 1 wherein the yarn inserting means comprises an arbor
selectively positionable in alignment with the tubular interior of the cop
for temporarily winding thereabout the remaining portion of the yarn end.
5. An apparatus for prepositioning a yarn end on a tubular spinning cop
according to claim 4 wherein the arbor includes a nozzle for blowing air
into the tubular interior of the cop, the arbor defining an oblique air
discharge outlet for winding thereabout of at least a part of the
remaining portion of the yarn end.
6. An apparatus for prepositioning a yarn end on a tubular spinning cop
according to claim 4 wherein the yarn inserting means further comprises a
pair of opposing nozzles for blowing air onto the remaining portion of the
yarn end and toward the tubular interior of the spinning cop to entrain
and deliver the remaining portion of the yarn end into the tubular
interior of the cop.
7. An apparatus for prepositioning a yarn end on a tubular spinning cop
according to claim 1 wherein the yarn inserting means is fixedly connected
with the yarn retaining means.
8. An apparatus for prepositioning a yarn end on a tubular spinning cop
according to claim 1 wherein the yarn retaining means comprises a cop
centering flap having a conical recess for centering engagement with the
nose portion of the cop.
9. An apparatus for prepositioning a yarn end on a tubular spinning cop
according to claim 1 wherein the yarn guide means and the yarn retaining
means are independently disposed pivotably about a common shaft.
10. An apparatus for prepositioning a yarn end on a tubular spinning cop
according to claim 1 wherein the cop preparation station is disposed along
a conveyor for transporting spinning cops each in upstanding disposition
on an arbor of a cop pallet and the drive is selectively movable into and
out of driving contact with the pallets on the conveyor.
11. An apparatus for prepositioning a yarn end on a tubular spinning cop
according to claim 10 wherein the drive includes means for reversing the
direction of rotation of the cop for sequential aspiration of the yarn end
with the suction nozzle and placement of the yarn end on the nose portion
of the spinning cop.
12. An apparatus for prepositioning a yarn end on a tubular spinning cop
according to claim 1 wherein the drive is connected with the controlling
means for selective setting of the driven speed of the cop.
Description
FIELD OF THE INVENTION
The present invention relates to an apparatus for prepositioning an end of
the yarn on spinning cops for subsequent unwinding in a bobbin winding
machine and more particularly to such an apparatus comprising a drive for
rotating the cop around its longitudinal axis, a suction nozzle with a
suction slit for aspirating and holding the yarn end to be positioned, a
cutting device for cutting the yarn end to length, a yarn guide means for
delivering the yarn to the nose of the cop for placing nose windings of
the yarn upon withdrawal from the suction nozzle, and means for inserting
the remaining yarn end portion into the interior of the tube of the
spinning cop.
BACKGROUND OF THE INVENTION
As a general rule, the terminal end of the yarn on a spinning cop is wound
by the spinning frame in such a way that it cannot easily be freed at a
winding station of a bobbin winding machine and transferred to its
appropriate yarn handling members. For this reason it is typically
necessary to provide a device or apparatus disposed between the spinning
frame and the winding station of the winding machine for prepositioning
the yarn end for the subsequent unwinding process. Various preparation
devices of this type are known from a number of patents. Basically, in
such devices, the yarn end is initially loosened and aspirated into the
suction slit of a suction nozzle by essentially pneumatic means of these
preparation devices which are, if necessary, aided by means which act
mechanically on the cop. During this process, the cop is turned opposite
to the winding direction of the yarn to make grasping of the yarn easier
and to enable the required length of the yarn to be freed after it has
been grasped. Grasping of the yarn end is usually monitored by sensors. A
cutting device, disposed at a fixed distance from the suction slit, is
used for the exact cutting to a consistent length of the yarn end in order
to always have a constant yarn length available for the subsequent yarn
prepositioning.
Prepositioning of the yarn can take place in various ways but, as already
mentioned, must always assure that problem-free release of the yarn end as
well as its supply to the appropriate grasping device of the winding
station is possible.
One manner of prepositioning the yarn end on the cop is to wind an endwise
length of the yarn about a nose portion of the cop. In doing so, it is
possible that the yarn may slacken in traveling from the preparation
device to the winding station, particularly in the case of relatively
slick yarns. Also, a length of the yarn may be inserted into the cop tube
but may be insufficient in length particularly with relatively small cops.
Further, the yarn length available for insertion into the tube is limited
by the distance between the tip of an arbor of a pallet on which cops are
customarily placed and the nose of the cop tube, which must be taken into
consideration in order to prevent the yarn end from being jammed between
the arbor and the tube thereby preventing the yarn from reaching the yarn
handling devices of the winding station.
One possibility for introducing a greater yarn length into the tube is
described in German Patent Publication DE 41 14 758 A1, wherein the yarn
end is aspirated into an air duct of the arbor. Appropriate retaining
elements are located inside this air duct to prevent the continued
aspiration of the yarn end.
A further possibility to increase the yarn length provided for grasping at
the winding machine is described in Japanese Patent Publication JP 3-120
174 A, wherein a nose winding of yarn is first placed on the nose of the
cop tube and subsequently a length of the remaining yarn is aspirated into
the tube. In the apparatus which performs this operation, a rod extends
from a first station at which the yarn end is sought and grasped to an
adjacent station at which the yarn end is deposited. This rod is disposed
in the path of the yarn extending between a slit of a suction nozzle,
which also extends between these two stations, and the cop itself. The
yarn is therefore placed around the rod. The rod is disposed at an
appropriate height such that its lower edge is located in the area of the
cop nose to be ready for winding. A nose winding is placed on the cop nose
with the aid of the rod by rotating the cop in the station in which the
yarn deposit is to take place. After cutting the yarn end, the remaining
yarn end is aspirated into the tube interior of the cop by means of an air
duct extending through the cop and through the arbor and base plate of a
pallet supporting the cop. As a result, the loop closes around the rod.
The cop is subsequently moved on and drawn over the end of the rod.
Because of this relative movement between the cop and the rod, it is
possible that the yarn end brought into the tube may inadvertently be
pulled out again if the yarn is snagged on the rod, for example because of
an unevenness on the rod.
SUMMARY OF THE INVENTION
It is accordingly an object of the present invention to provide a device
for prepositioning a yarn end on a spinning cop to facilitate subsequent
unwinding in a bobbin winder, having an improved functionality for
depositing a yarn end as a nose winding and in the cop tube.
Briefly summarized, this object is achieved in accordance with the present
invention by providing an apparatus for prepositioning a yarn end on a
tubular spinning cop which basically comprises a drive for rotating the
cop about its longitudinal axis at a cop preparation station, a suction
nozzle stationarily disposed at the cop preparation station for aspirating
and holding the yarn end, a cutting device for cutting the yarn end to
length, a yarn guide means for delivering a first portion of the yarn end
to the nose portion of the cop for placing nose windings of the yarn
thereabout, and means for inserting a remaining portion of the yarn end
into a tubular interior of the spinning cop.
According to the present invention, the nozzle has a yarn receiving slit
extending lengthwise of the cop to a terminal end of the slit axially
beyond a nose portion of the cop and the yarn guide means is movable
relative to the cop at the cop preparation station between an inactive
position spaced axially from the nose portion of the cop and an active
position generally alongside the nose portion of the cop. Yarn retaining
means is provided to be selectively movable into and out of contact with
the nose portion of the cop and has an opening for delivery of the yarn
end therethrough to the nose portion of the cop. Means are also provided
for controlling movement of the yarn guide means into the active position
during placement of nose windings about the portion of the cop and the
inactive position after placement of the nose windings and for controlling
activation of the yarn inserting means and movement of the yarn retaining
means out of contact with the nose portion of the cop after movement of
the yarn guide means into the inactive position.
The provision of a positionally changeable arrangement for the yarn guiding
means permits the yarn end remaining after placement of the nose windings
to be deposited in the interior of the cop tube without it being necessary
to place a loop over the yarn guiding means, as was the case in the prior
art. As a result, the yarn end has no contact at all with the yarn guide
means after it has been completely prepositioned. Also, the separate yarn
retaining means is not located between the yarn and the tube, but above
them. Thus, it is no longer necessary with the instant invention to move
parts out of a loop formed between the nose windings and the yarn section
deposited in the yarn interior, thereby eliminating the risk of destroying
the intended desired yarn deposition in the course of this relative
movement.
Furthermore, with the device in accordance with the present invention, the
remaining yarn end is automatically placed directly over the center of the
opening of the cop tube in the course of further rotation of the cop
following the formation of the nose winding and it can therefore be
reliably inserted into the cop tube. In the aforementioned prior art, not
only is the rod accomplishing the yarn guidance in the way of placing the
yarn end exactly over the tube nose, it is also additionally required in
the prior art to move the suction slit along the tube to a location above
the tube nose. In contrast thereto, it is possible in connection with the
instant invention to shorten the suction slit and to position it in a
stationary location alongside the cop to be prepared with the slit
terminating next to the tube nose, although at a slightly higher level. In
this manner, it is possible to perform the grasping and aspiration of the
yarn end as well as the subsequent prepositioning thereof on the spinning
cop at the same station. Furthermore, the suction air losses are reduced
by the shortened suction slit or alternately the aspiration force required
for grasping the yarn is increased.
The exact positioning of the yarn end directly over the tube nose makes it
possible to blow the yarn end into the tube interior, instead of
aspirating it. In turn, it is possible to omit a continuous bore in the
pallet or other cop holder, since it is possible to let the blown-in air
escape by an appropriate design of the arbor of the pallet below the tube
base, e.g., by forming the arbor of a ribbed configuration, which avoids
the further problems of the prior art in which the air duct of the pallet
can become clogged by dirt, lint, or debris from the underside of the
pallet in the course of rugged textile operations. In addition, improved
access to the cop from the top is possible in the course of aspirating the
transport devices disposed below the caddies.
Also, the blower nozzle can be obliquely disposed in the direction toward
the opening of the yarn retaining means to aid in moving the yarn end from
a position extending through the opening of the yarn retaining means, to
the upper tube opening of the spinning cop.
The present invention also permits an arbor to be arranged above the cop
nose which additionally increases the dependability of positioning the
yarn end portion to be inserted into the cop tube in respect to the
position in the longitudinal axis of the tube. By winding at least a part
of the yarn end portion to be inserted into the tube onto this arbor, it
is also possible to avoid the necessity of supplying a longer yarn section
through the opening of the yarn retaining means.
Delivery of the yarn section wound on the arbor into the tube can be
accomplished either by means of adjoining nozzles or advantageously by
designing the arbor itself as a nozzle. In each case, the blown air flow
should directly strike the yarn section wound on the arbor in order to
assure a proper yarn conveyance and also to reduce the required clock time
for the operation.
Since the arbor performs its function simultaneously with the yarn
retaining means, it is advantageous to connect both parts with each other.
The yarn retaining means can at the same time take over the function of a
centering flap which assures that the axis of rotation of the cop is fixed
when the cop is turned during the search for the yarn.
The disposition of the yarn guiding means and yarn retaining means on a
common pivot axis represents a simple construction of the device in
accordance with the invention.
If the conveyance of the yarn end into the tube interior by means of blown
air takes place from above, it is possible to arrange the device directly
on the straight transport path of the cop-mounted caddies. A conveyor belt
which transports the caddies by means of a frictional connection does not
need to be interrupted, which would be necessary in connection with the
prior art.
A reversible rotary drive for the cops is required in the device in
accordance with the present invention since the yarn search and subsequent
deposition of the yarn take place at the same station. By adjusting the
number of cop revolutions, it is possible to exactly fix the number of
nose windings and therefore also the length of the yarn end brought into
the tube interior. The latter is of importance particularly because the
yarn end is not intended to reach the arbor of the pallet, because then
jamming of the yarn end would be unavoidable.
The invention will be explained in detail below by means of exemplary
embodiments shown in the drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a side elevational view of a cop preparation station with
associated cop transport device, cop drive device, and yarn grasping and
yarn depositing devices in a starting position ready for a cop preparation
operation;
FIG. 2 is a partial side elevational view similar to FIG. 1 showing a cop
at the preparation station with nose windings having already been placed
on the cop by means of the grasped yarn end;
FIG. 3 is a top plan view of the corresponding station of FIG. 2;
FIG. 4 is another partial side elevational view similar to FIG. 2
illustrating the application of yarn windings on an arbor forming a nozzle
positioned above the nose of the cop tube;
FIG. 5 is a partial side elevational view similar to FIG. 4 but after the
yarn end wound on the arbor has been blown into the cop tube;
FIG. 6 is an enlarged perspective view representing the operational step
shown in FIG. 5;
FIG. 7 is a partial side elevational view of a cop preparation station
according to an alternative embodiment of the present invention having a
yarn blowing nozzle disposed obliquely above the cop being prepared,
instead of the arbor-forming nozzle of FIGS. 1-6; and
FIG. 8 is a partial side elevational view of a cop preparation station
according to another embodiment of the present invention equipped with a
centered arbor above the cop being prepared and oppositely disposed blower
nozzles.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring now to the accompanying drawings and initially to FIG. 1, a cop
preparation station is shown according to one embodiment of the present
invention, wherein a cop 1 is shown in the process of its yarn end being
aspirated into a suction tube 20. The cop 1 is supported in upstanding
disposition on an arbor 3'" of a pallet 3. The pallet 3 rests with its
base plate 3' on a conveyor belt 5 of a conveyor mechanism 4. A shoulder
3" is provided between the base plate 3' and the arbor 3'" which, among
other things, is used for guidance of the pallet 3 within a guide channel
6 of the conveyor 4. At the cop preparation station, the guide channel 6
has openings 6' and 6" on its opposite sides, through which extends a
drive means for the rotary driving of the pallet 3.
While the actual driving of the cop 1 takes place on one side of the
conveyor 4 by means of drive rollers 12,12' (see FIG. 3 in particular), a
single idler roller 7 on the opposite side of the conveyor 4 rests at the
same height against the base plate 3' of the pallet 3 to assure that the
base plate 3' is held pressed against the drive rollers 12 and 12' in
order to assure a dependable frictional drive of the drive.
The drive rollers 12,12' and a motor 16 are disposed on a common pivot
plate 17 on which the rollers 12,12' are rotatably seated and are fixedly
connected coaxially to respective pulleys 13,13'. A drive belt 14 extends
around the pulley 15 of the motor 16 and the two pulleys 13,13' of the
drive rollers 12,12', for synchronized driving of the two rollers 12,12'
is assured. The motor 16 is connected via a control line 16' with a
control device 54, by means of which the direction of rotation as well as
the speed (rpm) of the drive rollers 12,12' can be accurately controlled.
The pivot plate 17 is pivotably fixed about a pivot shaft 17' which is
fastened on a base plate 11 of the bobbin winding machine. A rotary joint
18 is attached to the pivot plate 17 and is connected with the piston of a
fluid cylinder 19 having a fluid connector 19' which is connected via a
valve (not shown) with a fluid source. The valve is also actuated by the
control device 54. Thus, the pivot plate 17 can be retracted from the
active drive position represented in FIGS. 1 and 3 by actuating the fluid
cylinder 19, so that the drive rollers 12,12' are withdrawn from the
opening 6' in the guide channel 6 out of the area of the conveyor 4
thereby leaving the conveyor channel 6 free of obstructions to the
conveyance of the pallet 3 and the cop 1.
The idler roller 7 is mounted on a similar pivot mechanism at the opposite
side of the conveyor 4, having a pivot plate 8 pivotable about a pivot
shaft 8' which is mounted in the base plate 11. The pivot plate 8 is
connected via a rotary joint 9 with the piston of a fluid cylinder 10
which has a fluid connector 10' which is also connected with a valve (not
shown) actuated by the control device 54.
The drive rollers 12,12' and the idler roller 7 define an operative yarn
end preparation position for cops at the cop preparation station. The
suction tube 20 is disposed at the cop preparation station adjacent to the
operative yarn end preparation position to be directly next to the cop 1.
The suction tube 20 has a suction slit 21 extending over the axial length
of the cop such that the upper end 21' of the slit 21 lies above the level
of the cop nose 2' or the upper edge of the tube 2.
In the illustration of FIG. 1, the yarn end 1' from the cop 1 is shown to
have already been aspirated through the suction slit 21 of the tube 20.
This yarn end 1' is thusly detected by a photodiode 22, opposite which a
light source 23 is placed. The light source 23 is energized via a power
supply line 23'. The photodiode 22 reports the interruption or weakening
of the impinging light caused by the passage of the yarn end to the
control unit 54 via a signal line 22'.
A yarn cutting device 24 is disposed within the suction tube 20 downstream
of the photodiode 22, as viewed in relation to the air flow direction in
the suction tube 20, which can also be controlled by the control device 54
via a control line 24'.
A shaft 26 is fastened to a support 27 disposed on the opposite side of the
conveyor 4 from the suction tube 20, about which a shaft 26, a centering
flap 25, a dog 36, and a frame 35 are pivotably mounted independently of
each other. However, by interlocking engagement with the centering flap
25, the dog 36 can cause integral movement of the centering flap 25 in a
counterclockwise direction (as viewed in FIG. 1). In the clockwise
direction, unitary movement of the dog 36 and the centering flap 25 is
accomplished by frictional connection of these components by means of a
spring 28 affixed to a bolt 37 extending from the dog 36 and directly to
the centering flap 25. This means a transferring movement permits biased
yielding of the flap 25 from the dog 36 in order to prevent the respective
tube 2 from being damaged in case of excessive tolerances in the
performance of pivoting movement in of the cop length.
The bolt 37 is connected with a piston head 38 which is seated on the free
end of a piston of a fluid cylinder 39. The fluid cylinder 39 has a fluid
connector 39' which is supplied via a valve (not shown) which can also be
controlled by the control device 54. Thus, it is possible in this manner
to pivot the centering flap around the shaft 26 by means of the fluid
cylinder 39 acting on the dog 36.
The frame 35 is of a configuration and size that it is pivotable outwardly
about the centering flap 25 without touching it (see FIG. 3). The frame 35
includes a guide contour 35" on its outward end located opposite the pivot
shaft 26, thereby forming a yarn guiding means for guiding engagement with
the yarn. An angled element 35' of the frame 35 is resiliently rests on
the centering flap 25 in the lower position of the frame 35 (FIG. 2).
The frame 35 is connected by a bolt 40 with a piston head 41 which is
attached to the free end of a piston of a fluid cylinder 42. The fluid
cylinder 42 can also be controlled via the control device 54 through fluid
connector 42' and a valve. The separate fluid cylinders 39 and 42 assure a
separate control of the centering flap 25 and the frame 35.
The underside of the centering flap 25 has a conical recess 29, which in
its operative position downwardly facing the conveyor belt 5, as shown in
FIG. 2, receives the upper end of the cop 1, while additionally serving as
a yarn retaining means after nose windings 1" of the yarn 1' (FIG. 4) have
been placed, as hereinafter described.
An arbor 31 is fastened by means of a holder 32 on the centering flap 25
and is tubular in configuration for use as a blower nozzle. The arbor 31
has an obliquely cut end opening 31' which, in the lowered position of the
centering flap 25, projects into the interior of the cop tube 2. The
tubular hollow interior of the arbor 31 is connected with a compressed air
line 34 via a valve 33 which is controlled via a control line 33' by the
control device 54.
The cop 1 is placed on the arbor 3'" of a pallet 3 and is transported along
the conveyor 4 into the cop preparation station by means of the conveyor
belt 5. The arrival of this transport unit at the cop preparation station
is detected by means of a sensor (not shown) and the pallet 3 is
subsequently stopped by an appropriate stopping device at the cop
preparation station actuated by the sensor. However, it is also possible
to utilize the oppositely located idler and driver rollers 7 and 12,12'
simultaneously as a stopping device by precisely timed control of their
associated fluid cylinders 10,19. In either case, the pallet 3 is then
exactly positioned at the station by pivoting the pivot plates 8 and 17,
which is particularly seen in FIG. 3.
Following the establishment of proper contact of the rollers 7 and 12,12'
with the circumference of the base plate 3' of the pallet 3, the motor 16
is actuated via the control line 16' by the control device 54 causing the
two drive rollers 12,12' to rotate via the belt 14 and, in turn, causing
the cop 1 to be rotated about its longitudinal axis. It is advantageous
for transmitting the rotary movement from the pallet 3 to the cop 1 if the
arbor 3'" of the pallet 3 is provided with resilient support elements on
its circumference, which improve the frictional engagement between the
tube 2 and the arbor 3'".
Initially, the cop 1 is turned opposite to the yarn winding direction. The
cutting device 24 in the suction tube 20 is opened at the same time, which
usually is simultaneously used as a blocking flap for the suction air.
Suction is thereby appropriately applied to the periphery of the cop 1
through the slit 21, so that the end 1' of the yarn thereon can be
aspirated through this suction slit 21 by the suction tube 20. The yarn
end 1' is sucked progressively into the suction tube 20 and passes the
photodiode 22, which detects and reports the grasping of the yarn end 1'
to the control device 54 via the signal line 22' as aforedescribed. The
motor 16 is stopped thereupon to prevent further unwinding of yarn from
the cop 1. The cutting device 24 is subsequently actuated, by means of
which the length of yarn pulled off the cop 1 is clearly defined by the
distance from the cutting device 24.
However, it may be desirable to vary this yarn length according to the
predetermined number of nose windings 1" to be formed and in relation to
the diameter of the tube 2 of the cop 1. A longer yarn end 1' can be
provided by continuing to turn the cop 1 in the yarn unwinding direction
after the cutting device 24 has been actuated, and immediately opening the
cutting device again following cutting, thereby re-establishing the
application of suction air to the yarn end. The number of turns of the cop
following cutting determines the additional length of the yarn end 1'
sucked into the tube 20. Care should be taken in every case that the yarn
end 1'" remaining after placing the nose windings 1" (as hereinafter
described) is not long enough to reach the arbor 3'" of the pallet 3 upon
insertion of the yarn into the cop tube in order to prevent the jamming of
this yarn end.
Following the cutting to length of the yarn end 1', the two fluid cylinders
39 and 42 are actuated to pivot the centering flap 25 and the frame 35 in
a clockwise direction into the positions shown in FIGS. 2 or 3. Notably,
however, the instant construction also makes it possible to actively
operate only the fluid cylinder 42, while the centering flap 25 is caused
to move as a unit therewith by engagement of the angled element 35' of the
frame 35 with the flap 25.
Once the operative position of the centering flap 25 and the frame 35
illustrated in FIGS. 2 and 3 has been attained, the motor 16 is again
actuated via the control line 16', but in this case, the motor is caused
to rotate in an opposite direction to rotate the cop 1 in the winding
direction of the yarn thereon. The aspirated length of yarn is deflected
over a guide contour 35" of the lowered frame 35 such that the yarn is
placed in the form of nose windings 1" on the nose portion 2' of the cop
tube, as can be seen from FIG. 2.
Subsequently, as represented in FIG. 4, while the direction of rotation of
the cop 1 is maintained, the frame 35 is pivoted counterclockwise back
into its original rest position. In the course of this movement, the
piston of the fluid cylinder 39 must remain extended in order to keep
pressing the conical recess 29 of the centering flap 25 against the upper
end edge 2" of the cop tube by means of the spring 28. As a result, the
yarn end 1' extends from the area of the nose windings 1" as far as a
clamping point between the upper end edge 2" of the tube and the conical
recess 29 and therefrom through a forward opening 30 of the centering flap
25 directed into the suction tube 20 about a deflection edge 21' of the
suction slit 21. Thus, by continuing the rotation of the cop 1, the yarn
is wound onto the obliquely cut portion of the arbor 31 about the opening
31". The valve 33 is actuated via the control line 33' after a defined
period of time to connect the tubular arbor 31 to the compressed air line
34 thereby causing the arbor 31 to function also as a nozzle.
As can be seen from FIG. 5, the delivery of compressed air into the arbor
31 causes the yarn end portion 1'" wound about the arbor 31 to be loosened
in the area of the opening 31' and to be blown into the interior of the
adjacent cop tube. As seen in FIG. 1, the arbor 3'" of the pallet 3 is
ribbed so that this air can exit above the base 3" of the pallet 3 between
the ribs of the arbor 3'" and the tube 2. However, even if such air vents
are not provided, a dependable insertion of the yarn end 1'" is still
assured by controlling the amount of air blown into the cop tube.
An enlarged perspective representation is shown in FIG. 6 to illustrate the
next operational step in which the centering flap 25 is upwardly pivoted
to return into its initial position. It can also be seen here that there
is no loop of yarn between the nose windings 1" and the succeeding yarn
end 1'" inserted into the cop tube but instead the yarn extends directly
over the upper edge 2" of the tube.
An alternative embodiment of the present invention is shown in FIG. 7, in
which the arbor 31 for projecting axially into the interior of the cop
tube has been omitted and replaced with an air nozzle 43 attached to the
centering flap 25 by means of an attachment plate 44 to be disposed at a
laterally oblique inclination to a cop tube 2 at the preparation station.
The remaining moving parts of this device are identical to the first
exemplary embodiment of FIGS. 1-6. The operational step illustrated in
FIG. 7 corresponds to the step shown in FIG. 4 in connection with the
first embodiment. In this case, after the placement of the nose windings
1" on the nose portion 2' of the cop 2, the yarn end portion 1'" extends
in a straight line through the opening 30 of the centering flap 25 into
and through the suction slit 21. By continued rotation of the cop 1 in the
winding direction the yarn comes to rest obliquely in the form of a chord
across the upwardly facing opening into the tube 2. Thereupon, a valve 45
in the nozzle 43 is triggered via a control line 45' by the control device
54 to connect the nozzle 43 with a compressed air line 46 at the time when
the yarn assumes the described position across the tube opening, causing
the remaining yarn end portion 1'"to be blown into the tube interior by
the nozzle 43. In this embodiment, the inclination of the nozzle 43 has
been selected to effect a withdrawal action on the yarn portion 1'" still
remaining in the suction slit 21.
In the further embodiment of the invention shown in FIG. 8, a yarn winding
arbor 47 similar in function to the arbor 31 of FIGS. 1-6 is fastened by
means of a holder 47' on the centering flap 25' but, in contrast to the
first embodiment, this arbor 47 is not tubular or otherwise configured to
function as a nozzle. Blowing of the yarn from the arbor 47 is
accomplished in this embodiment by oblique nozzle bores 48,49 formed in
the centering flap 25' and connected respectively via valves 50 and 51 to
compressed air lines 52 and 53. The valves 50 and 51 can be controlled by
the control device 54 via control lines 50' and 51'. The terminal ends of
the nozzle bores 48,49 open into the conical recess 29' of the centering
flap 25' at a height and at an angle such that the flow of the compressed
air is directly placed on the yarn windings placed on the arbor 47.
It should be noted that the number of yarn windings placed on an arbor
31,47 can be selectively varied in accordance a particular winding
operation. For example, it is easily possible to wind the yarn less than
once around the arbor and then to blow the partial yarn winding off the
arbor. In this case, the arbor only has the function of holding at least a
part of the yarn precisely over the longitudinal axis of the tube.
However, if there is a comparatively large cop into which it is possible
to blow a longer yarn piece, it is advantageous to collect yarn in the
form of several windings on the arbor in order to assure an accelerated
transfer of these yarn ends into the tube interior.
Even though the invention has been described with particular reference to
the use of blower devices for inserting into a cop tube the yarn end
portion remaining after formation of nose windings, it is to be understood
that the substance of the invention does not preclude the aspiration of
the yarn end into a pallet through an air duct.
It will therefore be readily understood by those persons skilled in the art
that the present invention is susceptible of broad utility and
application. Many embodiments and adaptations of the present invention
other than those herein described, as well as many variations,
modifications and equivalent arrangements will be apparent from or
reasonably suggested by the present invention and the foregoing
description thereof, without departing from the substance or scope of the
present invention. Accordingly, while the present invention has been
described herein in detail in relation to its preferred embodiment, it is
to be understood that this disclosure is only illustrative and exemplary
of the present invention and is made merely for purposes of providing a
full and enabling disclosure of the invention. The foregoing disclosure is
not intended or to be construed to limit the present invention or
otherwise to exclude any such other embodiments, adaptations, variations,
modifications and equivalent arrangements, the present invention being
limited only by the claims appended hereto and the equivalents thereof.
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